Primary myelofibrosis (PMF) in prefibrotic stage

This peripheral blood film (May-Grünwald-Giemsa stain) is from a patient with PMF (also called CIMF) in the prefibrotic stage. You can see scattered teardrop cells (->). Furthermore, a few granulocytic precursors and very few erythroblasts were detected (not shown). The automated cell count showed slight leukocytosis, thrombocytosis and anaemia.